'Radiation is a process in which energy particles or waves travel through a medium, space or object. It does not deposit itself in plants or the organs or tissues of animals or humans. It is typically measured in mrems, rads and sieverts.
Radioactivity is the release of energy by emitting ionizing particles ( ionizing radiation). The emission is spontaneous, and it is released into the environment, biosphere, plants, animals and human beings.
There are more than 400 radioactive isotopes that are released in a nuclear accident such as those now admitted in Japan. Out of those isotopes, there are many that are too short lived to be dangerous to humans. However, approximately 50 of these isotopes are indeed very dangerous to humans including strontium-90, cesium, iodine, plutonium, and tranuranium elements, since they can be absorbed by the human body.'
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